Which of the following roles does zinc play in the human body?

Zinc plays a crucial role in normal growth and development within the human body, making it an essential mineral for various physiological processes. It is involved in numerous enzymatic reactions and is vital for DNA synthesis, cell division, and overall cellular metabolism. Adequate levels of zinc are especially important during periods of rapid growth, such as childhood, adolescence, and pregnancy, as it supports proper immune function, neurological health, and the maintenance of skin integrity.

The significance of zinc in growth and development helps highlight its role in ensuring that biological functions are carried out efficiently. This includes supporting the formation of proteins and hormones necessary for growth, thus emphasizing its overall biological importance. The body requires a consistent supply of zinc from the diet, as it cannot produce or store it, and deficiencies can lead to stunted growth and developmental issues.

Other options reflect functions not primarily associated with zinc. For example, fluid balance is more closely linked to electrolytes such as sodium, potassium, and chloride. While zinc does play some supportive roles in bone health due to its involvement in cell activity and metabolism, it is not chiefly recognized for bone strengthening compared to minerals like calcium and phosphorus. Muscle relaxation is typically influenced by magnesium, calcium, and other electrolytes rather than zinc.